#!/usr/bin/env python

# -*- coding:utf-8 -*-

__author__ = 'MFC'

__time__ = '18/9/14 09:41'

"""

列表推导式 list comprehension (listcomps)

生成器表达式 generator expression (genexps)

P72-73 2.2.2 列表推导同filter和map的比较

filter和map合起来能做的事情，列表推推导式也可以做到，且不需要难以理解和阅读的lambda表达式

"""

import time

def timeit(func):

def wrapper(*args,**kwargs):

start = time.clock()

func()

end = time.clock()

print("function used: {} s".format(end-start))

return wrapper

symbols = "$＊$€¥¢£₽₵₤"

start1 = time.clock()

beyond_ascii = [ord(s) for s in symbols if ord(s) > 127]

end1 = time.clock()

elapsed_time1 = end1-start1

print(beyond_ascii)

print(elapsed_time1)

# 则种方法明显复杂了

start2 = time.clock()

beyond_ascii = list(filter(lambda c: c > 127, map(ord, symbols)))

end2 = time.clock()

elapsed_time2 = end2-start2

print(beyond_ascii)

print(elapsed_time2)

print(elapsed_time1>elapsed_time2)